Piston packing-ring.



J- "ofL'BVELL- PISTON PACKING RING. APPLICATION m SEPT. 19. 1914.

Patenmd May 2, 1916.

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INVENTOR %Am/ BY A TTORNEY UNITED STATES PATENT OFFICE.

JAMES S. LAVELL. OF SCEHENECTADY. NEW YORK, ASSIGNOR OF ONE-HALF TO NRYC. FA'GAL. OF SCHENEGTADY. NEW YORK.

PISTON PACKING-RING.

Application filed September 19. 1914.

To all whom it may concern:

Be it known that I. Jun-1s S. L \vI-:I.I,. a citizen of the l'nitedStates. residing at Schenectady. county of Schenectady. aml State of NewYork. have invented certain new and useful Improvements in lis-tonPacking-Rings. of which the following i a specification.

The invention relates to such improvements and consists of the novelconstruc tion and combination of parts hereinafter "described and.subsequently claimed.

Reference may he had to the accompairving drawingsand the referencecharacters marked thereon. which form a part of this specification.Similar character refer to similar parts in the several figures therein.

Figure 1 of the drawings is a plan view of a pistonpacking-ring made inaccordam-e With my invention. l ig. i is a view in side elevation of thesame. Fig. is a view in side elevation. partly in section. of the cutresilient inner ring.

The principal object of the invention is to provide for a close contactbetween the piston-ring and the cylinder. throughout the peripheralextent of the ring.

In carrying out my invention I employ a cut resilient inner ring. 1.adapted to be con fined under compression within an outer ring formed ofthree equal segments. '3. ra beted at their ends. o. to make lappingengagement with each other and form substantiaily tight joints when thering is confined within the cylinder. The ends of the cut inner ring. 1.preferably form a lapping joint. as by cutting through the ringdiagonally. as shown at in Fig.

The three segments. 2. of the outer ring have their outer surfacesturned or dressed to form together a true cylindrical surface adapted toclosely fit the interior of the cylinder for which the ring is intended.and each of the segments. 2. is made thicker at about its middle than atits ends. thus providing at its middle a point. or comparatively smallarea. of colitact with the outer surface of the cut inner ring. 1. -Theends of the respective segments. 2. are thus slightly spaced away at 5from the inner ring. 1. thus providing for a slight rocking movement ofthe separate segments. 2. about their respective points of contact. 1.with the inner ring. permitting each segment to ad- Specification ofLetters Patent.

l'at ented May 2. 1916 Serial No. 862.520.

in t itself to the inner wall of the cvlinder independently of the othersegments. .\s' the interior of the cylinder becomes worn. thiscapability for independent self-adjustment of the egments. L. make ver vclose contact with the inner surface of the cylinder.

By employing three segments in the ollte! ring aml having the innerresilient ring bear upon the re pective segments only at their middlepoints. the resilient force of the inner ring is always effectively ande ually dis triluited among the segments of the outer ring: and therocking movement. whereby each segment of the outer ring is free toadjust itself. causes the outward pressure of the inner ring to be quiteuniformly di tri uted to all part of the outer ring.

.\s a preferred form for the segments. 3. l have shown the inner surfaceof each seg ment formed as an arc eccentric to the outer urface. so thatea h segment is meniscoidal in form and gradually tapers from itsthicker middle portion to its respect ve end hat I claim as new anddesire to secure by Letters latent is l. pistoirpacking-ring comprisingan outer segmental ring divided into three equal segments. the outersurfaces of which foriu a cylindrical surface corresponding in diameterwith the interior of the cylinder for which the ring is adapted. and acut resilient inner ring adapted to be confined umler com pressionwithin said segmental ring. the several segments being thicker at themiddle than at the ends. whereby they make contact only at their middlewith said inner ring.

'3. )iston-packing-ring comprising an outer segmental ring having threeequal meniscoidal segments. each having an outer surface forming an arcof the same radius as the interior of the cylinder for which the ring isadapted. and an inner surface forming an arc eccentric tozsaid outersurface. and a cut resilient inner" ring adapted tolueontined undercompression within said segmental outer ring. in simple Contact with themiddle points of the respective segments.

In testimony whereof. I have hereunto set my hand this 14th day ofSeptember. 1911.

JAMES S. LAVELL.

\Vitnesses MARK STERN, Jonx K. ALEXAXDER.

ena les the ring to

